It has also been announced that composer Nicholas Hooper will create the film's score, reuniting him with director David Yates for whom he has scored multiple film and television projects, dating back more than 15 years. Hooper won a BAFTA Award for his work on the Yates-directed television movie "The Young Visiters." Their other collaborations include the telefilm "The Girl in the Cafe," written by Richard Curtis; "State of Play," which earned multiple honors, including seven BAFTA nominations; "The Way We Live Now"; and "The Tichborne Claimant."

Bonham Carter joins a cast of returning "Harry Potter" veterans, including Daniel Radcliffe, Rupert Grint and Emma Watson, who are reprising their roles as close-knit teen wizards Harry Potter, Ron Weasley and Hermione Granger. The stellar cast also includes Robbie Coltrane, Ralph Fiennes, Michael Gambon, Brendan Gleeson, Jason Isaacs, Gary Oldman, Alan Rickman, Maggie Smith, Emma Thompson, Julie Walters, David Thewlis, Fiona Shaw, Richard Griffiths, David Bradley, Robert Hardy and Mark Williams.

As Bellatrix Lestrange, Bonham Carter is only one of several newcomers to the "Harry Potter" film franchise, also including: Imelda Staunton as Dolores Umbridge; George Harris as Kingsley Shacklebolt; Natalia Tena playing Nymphadora Tonks; Kathryn Hunter in the role of Mrs. Figg; and 14-year-old actress Evanna Lynch, who plays Luna Lovegood.

The fifth film adaptation of J.K. Rowling's "Harry Potter" novel series, "Harry Potter and the Order of the Phoenix" is being directed by award-winning British filmmaker David Yates ("The Girl in the Cafe," "Sex Traffic," "State of Play") and produced by "Harry Potter" film series producer David Heyman, and David Barron, from a screenplay by Michael Goldenberg ("Where the Wild Things Are," "Peter Pan," "Contact").

"Harry Potter and the Order of the Phoenix" will be released in 2007 by Warner Bros. Pictures, a Warner Bros. Entertainment Company.